/Engine/Source/Runtime/Core/Public/Math/RotationMatrix.h
Builds a matrix with given Z and X axes. Z will remain fixed, X may be changed minimally to enforce orthogonality. Y will be computed. Inputs need not be normalized.
static [TMatrix](API\Runtime\Core\Math\TMatrix)< T > MakeFromZX ( [TVector](API\Runtime\Core\Math\TVector)< T > const & ZAxis, [TVector](API\Runtime\Core\Math\TVector)< T > const & XAxis )